157798609 has 2 divisors, whose sum is σ = 157798610. Its totient is φ = 157798608.

The previous prime is 157798579. The next prime is 157798621. The reversal of 157798609 is 906897751.

It is a happy number.

157798609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148157584 + 9641025 = 12172^2 + 3105^2 .

It is a cyclic number.

It is not a de Polignac number, because 157798609 - 2⁵ = 157798577 is a prime.

It is not a weakly prime, because it can be changed into another prime (157798409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78899304 + 78899305.

It is an arithmetic number, because the mean of its divisors is an integer number (78899305).

Almost surely, 2^157798609 is an apocalyptic number.

It is an amenable number.

157798609 is a deficient number, since it is larger than the sum of its proper divisors (1).

157798609 is an equidigital number, since it uses as much as digits as its factorization.

157798609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 52.

The square root of 157798609 is about 12561.7916317697. The cubic root of 157798609 is about 540.3822270989.

The spelling of 157798609 in words is "one hundred fifty-seven million, seven hundred ninety-eight thousand, six hundred nine".